renewing customers

I'm kind of new to this site. I have about 35 verbal accounts(residential).Mowing starts up here around the 3rd week in march. Just wondering what do you guys think when would be good to call customers and ask if they want me to mow again. any other suggestions would also be helpful. *also, last year was my first year on my own.

Send out a letter at the beginning of the year letting your custoemrs know you are still there, and welcome them to a new year and tell them when your season starts.Confim with them the price of the service for the new year as well.

thanks for the replies.so i guess i can put something in the letter telling them approximately when i will start and just tell them with any questions or concerns to call me? also. what about mid feb. sending them out?

While renewing accounts automatically sounds good, houses sell, people die, and people make other arrangements without telling you. So doing work for someone that is not going to pay you doesn't sit well with me. So every year we have to send out new contracts but you do get to review them as you do. And we raise prices where needed it allows you to ask yourself did I even make money on the account and do I even want that account back.